File Browser Doesn't Open in Some Browsers
While not necessarily limited by browser, Internet Explorer's behavioral differences for contentReady and domReady events make the bug more apparent in that browser. And while the bug presents commonly with File Browser (in vBulletin without ckEditor), it is due to a flaw that can potentially affect any VaultWiki Javascript code that subscribes to vw_Hard_Core.kindle
If the subscription occurs after vw_Hard_Core has fired its init event, then the subscribed function will never be executed. In the case of File Browser, it means the button never gets assigned as its opener.
Fixed in the next release. If a subscription is attempted after events have begun firing, the subscription will be instantly fired.